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Filename : Matrix.php
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<?php
/**
 * @package JAMA
 */

/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
	/**
	 * @ignore
	 */
	define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../../');
	require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}


/*
 *	Matrix class
 *
 *	@author Paul Meagher
 *	@author Michael Bommarito
 *	@author Lukasz Karapuda
 *	@author Bartek Matosiuk
 *	@version 1.8
 *	@license PHP v3.0
 *	@see http://math.nist.gov/javanumerics/jama/
 */
class PHPExcel_Shared_JAMA_Matrix {


	const PolymorphicArgumentException	= "Invalid argument pattern for polymorphic function.";
	const ArgumentTypeException			= "Invalid argument type.";
	const ArgumentBoundsException		= "Invalid argument range.";
	const MatrixDimensionException		= "Matrix dimensions are not equal.";
	const ArrayLengthException			= "Array length must be a multiple of m.";

	/**
	 *	Matrix storage
	 *
	 *	@var array
	 *	@access public
	 */
	public $A = array();

	/**
	 *	Matrix row dimension
	 *
	 *	@var int
	 *	@access private
	 */
	private $m;

	/**
	 *	Matrix column dimension
	 *
	 *	@var int
	 *	@access private
	 */
	private $n;


	/**
	 *	Polymorphic constructor
	 *
	 *	As PHP has no support for polymorphic constructors, we hack our own sort of polymorphism using func_num_args, func_get_arg, and gettype. In essence, we're just implementing a simple RTTI filter and calling the appropriate constructor.
	 */
	public function __construct() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				//Rectangular matrix - m x n initialized from 2D array
				case 'array':
						$this->m = count($args[0]);
						$this->n = count($args[0][0]);
						$this->A = $args[0];
						break;
				//Square matrix - n x n
				case 'integer':
						$this->m = $args[0];
						$this->n = $args[0];
						$this->A = array_fill(0, $this->m, array_fill(0, $this->n, 0));
						break;
				//Rectangular matrix - m x n
				case 'integer,integer':
						$this->m = $args[0];
						$this->n = $args[1];
						$this->A = array_fill(0, $this->m, array_fill(0, $this->n, 0));
						break;
				//Rectangular matrix - m x n initialized from packed array
				case 'array,integer':
						$this->m = $args[1];
						if ($this->m != 0) {
							$this->n = count($args[0]) / $this->m;
						} else {
							$this->n = 0;
						}
						if (($this->m * $this->n) == count($args[0])) {
							for($i = 0; $i < $this->m; ++$i) {
								for($j = 0; $j < $this->n; ++$j) {
									$this->A[$i][$j] = $args[0][$i + $j * $this->m];
								}
							}
						} else {
							throw new PHPExcel_Calculation_Exception(self::ArrayLengthException);
						}
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function __construct()


	/**
	 *	getArray
	 *
	 *	@return array Matrix array
	 */
	public function getArray() {
		return $this->A;
	}	//	function getArray()


	/**
	 *	getRowDimension
	 *
	 *	@return int Row dimension
	 */
	public function getRowDimension() {
		return $this->m;
	}	//	function getRowDimension()


	/**
	 *	getColumnDimension
	 *
	 *	@return int Column dimension
	 */
	public function getColumnDimension() {
		return $this->n;
	}	//	function getColumnDimension()


	/**
	 *	get
	 *
	 *	Get the i,j-th element of the matrix.
	 *	@param int $i Row position
	 *	@param int $j Column position
	 *	@return mixed Element (int/float/double)
	 */
	public function get($i = null, $j = null) {
		return $this->A[$i][$j];
	}	//	function get()


	/**
	 *	getMatrix
	 *
	 *	Get a submatrix
	 *	@param int $i0 Initial row index
	 *	@param int $iF Final row index
	 *	@param int $j0 Initial column index
	 *	@param int $jF Final column index
	 *	@return Matrix Submatrix
	 */
	public function getMatrix() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				//A($i0...; $j0...)
				case 'integer,integer':
						list($i0, $j0) = $args;
						if ($i0 >= 0) { $m = $this->m - $i0; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						if ($j0 >= 0) { $n = $this->n - $j0; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						$R = new PHPExcel_Shared_JAMA_Matrix($m, $n);
						for($i = $i0; $i < $this->m; ++$i) {
							for($j = $j0; $j < $this->n; ++$j) {
								$R->set($i, $j, $this->A[$i][$j]);
							}
						}
						return $R;
						break;
				//A($i0...$iF; $j0...$jF)
				case 'integer,integer,integer,integer':
						list($i0, $iF, $j0, $jF) = $args;
						if (($iF > $i0) && ($this->m >= $iF) && ($i0 >= 0)) { $m = $iF - $i0; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						if (($jF > $j0) && ($this->n >= $jF) && ($j0 >= 0)) { $n = $jF - $j0; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						$R = new PHPExcel_Shared_JAMA_Matrix($m+1, $n+1);
						for($i = $i0; $i <= $iF; ++$i) {
							for($j = $j0; $j <= $jF; ++$j) {
								$R->set($i - $i0, $j - $j0, $this->A[$i][$j]);
							}
						}
						return $R;
						break;
				//$R = array of row indices; $C = array of column indices
				case 'array,array':
						list($RL, $CL) = $args;
						if (count($RL) > 0) { $m = count($RL); } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						if (count($CL) > 0) { $n = count($CL); } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						$R = new PHPExcel_Shared_JAMA_Matrix($m, $n);
						for($i = 0; $i < $m; ++$i) {
							for($j = 0; $j < $n; ++$j) {
								$R->set($i - $i0, $j - $j0, $this->A[$RL[$i]][$CL[$j]]);
							}
						}
						return $R;
						break;
				//$RL = array of row indices; $CL = array of column indices
				case 'array,array':
						list($RL, $CL) = $args;
						if (count($RL) > 0) { $m = count($RL); } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						if (count($CL) > 0) { $n = count($CL); } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						$R = new PHPExcel_Shared_JAMA_Matrix($m, $n);
						for($i = 0; $i < $m; ++$i) {
							for($j = 0; $j < $n; ++$j) {
								$R->set($i, $j, $this->A[$RL[$i]][$CL[$j]]);
							}
						}
						return $R;
						break;
				//A($i0...$iF); $CL = array of column indices
				case 'integer,integer,array':
						list($i0, $iF, $CL) = $args;
						if (($iF > $i0) && ($this->m >= $iF) && ($i0 >= 0)) { $m = $iF - $i0; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						if (count($CL) > 0) { $n = count($CL); } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						$R = new PHPExcel_Shared_JAMA_Matrix($m, $n);
						for($i = $i0; $i < $iF; ++$i) {
							for($j = 0; $j < $n; ++$j) {
								$R->set($i - $i0, $j, $this->A[$RL[$i]][$j]);
							}
						}
						return $R;
						break;
				//$RL = array of row indices
				case 'array,integer,integer':
						list($RL, $j0, $jF) = $args;
						if (count($RL) > 0) { $m = count($RL); } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						if (($jF >= $j0) && ($this->n >= $jF) && ($j0 >= 0)) { $n = $jF - $j0; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentBoundsException); }
						$R = new PHPExcel_Shared_JAMA_Matrix($m, $n+1);
						for($i = 0; $i < $m; ++$i) {
							for($j = $j0; $j <= $jF; ++$j) {
								$R->set($i, $j - $j0, $this->A[$RL[$i]][$j]);
							}
						}
						return $R;
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function getMatrix()


	/**
	 *	checkMatrixDimensions
	 *
	 *	Is matrix B the same size?
	 *	@param Matrix $B Matrix B
	 *	@return boolean
	 */
	public function checkMatrixDimensions($B = null) {
		if ($B instanceof PHPExcel_Shared_JAMA_Matrix) {
			if (($this->m == $B->getRowDimension()) && ($this->n == $B->getColumnDimension())) {
				return true;
			} else {
				throw new PHPExcel_Calculation_Exception(self::MatrixDimensionException);
			}
		} else {
			throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException);
		}
	}	//	function checkMatrixDimensions()



	/**
	 *	set
	 *
	 *	Set the i,j-th element of the matrix.
	 *	@param int $i Row position
	 *	@param int $j Column position
	 *	@param mixed $c Int/float/double value
	 *	@return mixed Element (int/float/double)
	 */
	public function set($i = null, $j = null, $c = null) {
		// Optimized set version just has this
		$this->A[$i][$j] = $c;
	}	//	function set()


	/**
	 *	identity
	 *
	 *	Generate an identity matrix.
	 *	@param int $m Row dimension
	 *	@param int $n Column dimension
	 *	@return Matrix Identity matrix
	 */
	public function identity($m = null, $n = null) {
		return $this->diagonal($m, $n, 1);
	}	//	function identity()


	/**
	 *	diagonal
	 *
	 *	Generate a diagonal matrix
	 *	@param int $m Row dimension
	 *	@param int $n Column dimension
	 *	@param mixed $c Diagonal value
	 *	@return Matrix Diagonal matrix
	 */
	public function diagonal($m = null, $n = null, $c = 1) {
		$R = new PHPExcel_Shared_JAMA_Matrix($m, $n);
		for($i = 0; $i < $m; ++$i) {
			$R->set($i, $i, $c);
		}
		return $R;
	}	//	function diagonal()


	/**
	 *	getMatrixByRow
	 *
	 *	Get a submatrix by row index/range
	 *	@param int $i0 Initial row index
	 *	@param int $iF Final row index
	 *	@return Matrix Submatrix
	 */
	public function getMatrixByRow($i0 = null, $iF = null) {
		if (is_int($i0)) {
			if (is_int($iF)) {
				return $this->getMatrix($i0, 0, $iF + 1, $this->n);
			} else {
				return $this->getMatrix($i0, 0, $i0 + 1, $this->n);
			}
		} else {
			throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException);
		}
	}	//	function getMatrixByRow()


	/**
	 *	getMatrixByCol
	 *
	 *	Get a submatrix by column index/range
	 *	@param int $i0 Initial column index
	 *	@param int $iF Final column index
	 *	@return Matrix Submatrix
	 */
	public function getMatrixByCol($j0 = null, $jF = null) {
		if (is_int($j0)) {
			if (is_int($jF)) {
				return $this->getMatrix(0, $j0, $this->m, $jF + 1);
			} else {
				return $this->getMatrix(0, $j0, $this->m, $j0 + 1);
			}
		} else {
			throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException);
		}
	}	//	function getMatrixByCol()


	/**
	 *	transpose
	 *
	 *	Tranpose matrix
	 *	@return Matrix Transposed matrix
	 */
	public function transpose() {
		$R = new PHPExcel_Shared_JAMA_Matrix($this->n, $this->m);
		for($i = 0; $i < $this->m; ++$i) {
			for($j = 0; $j < $this->n; ++$j) {
				$R->set($j, $i, $this->A[$i][$j]);
			}
		}
		return $R;
	}	//	function transpose()


	/**
	 *	trace
	 *
	 *	Sum of diagonal elements
	 *	@return float Sum of diagonal elements
	 */
	public function trace() {
		$s = 0;
		$n = min($this->m, $this->n);
		for($i = 0; $i < $n; ++$i) {
			$s += $this->A[$i][$i];
		}
		return $s;
	}	//	function trace()


	/**
	 *	uminus
	 *
	 *	Unary minus matrix -A
	 *	@return Matrix Unary minus matrix
	 */
	public function uminus() {
	}	//	function uminus()


	/**
	 *	plus
	 *
	 *	A + B
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Sum
	 */
	public function plus() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$M->set($i, $j, $M->get($i, $j) + $this->A[$i][$j]);
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function plus()


	/**
	 *	plusEquals
	 *
	 *	A = A + B
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Sum
	 */
	public function plusEquals() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$validValues = True;
					$value = $M->get($i, $j);
					if ((is_string($this->A[$i][$j])) && (strlen($this->A[$i][$j]) > 0) && (!is_numeric($this->A[$i][$j]))) {
						$this->A[$i][$j] = trim($this->A[$i][$j],'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($this->A[$i][$j]);
					}
					if ((is_string($value)) && (strlen($value) > 0) && (!is_numeric($value))) {
						$value = trim($value,'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($value);
					}
					if ($validValues) {
						$this->A[$i][$j] += $value;
					} else {
						$this->A[$i][$j] = PHPExcel_Calculation_Functions::NaN();
					}
				}
			}
			return $this;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function plusEquals()


	/**
	 *	minus
	 *
	 *	A - B
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Sum
	 */
	public function minus() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$M->set($i, $j, $M->get($i, $j) - $this->A[$i][$j]);
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function minus()


	/**
	 *	minusEquals
	 *
	 *	A = A - B
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Sum
	 */
	public function minusEquals() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$validValues = True;
					$value = $M->get($i, $j);
					if ((is_string($this->A[$i][$j])) && (strlen($this->A[$i][$j]) > 0) && (!is_numeric($this->A[$i][$j]))) {
						$this->A[$i][$j] = trim($this->A[$i][$j],'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($this->A[$i][$j]);
					}
					if ((is_string($value)) && (strlen($value) > 0) && (!is_numeric($value))) {
						$value = trim($value,'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($value);
					}
					if ($validValues) {
						$this->A[$i][$j] -= $value;
					} else {
						$this->A[$i][$j] = PHPExcel_Calculation_Functions::NaN();
					}
				}
			}
			return $this;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function minusEquals()


	/**
	 *	arrayTimes
	 *
	 *	Element-by-element multiplication
	 *	Cij = Aij * Bij
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Matrix Cij
	 */
	public function arrayTimes() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$M->set($i, $j, $M->get($i, $j) * $this->A[$i][$j]);
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function arrayTimes()


	/**
	 *	arrayTimesEquals
	 *
	 *	Element-by-element multiplication
	 *	Aij = Aij * Bij
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Matrix Aij
	 */
	public function arrayTimesEquals() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$validValues = True;
					$value = $M->get($i, $j);
					if ((is_string($this->A[$i][$j])) && (strlen($this->A[$i][$j]) > 0) && (!is_numeric($this->A[$i][$j]))) {
						$this->A[$i][$j] = trim($this->A[$i][$j],'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($this->A[$i][$j]);
					}
					if ((is_string($value)) && (strlen($value) > 0) && (!is_numeric($value))) {
						$value = trim($value,'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($value);
					}
					if ($validValues) {
						$this->A[$i][$j] *= $value;
					} else {
						$this->A[$i][$j] = PHPExcel_Calculation_Functions::NaN();
					}
				}
			}
			return $this;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function arrayTimesEquals()


	/**
	 *	arrayRightDivide
	 *
	 *	Element-by-element right division
	 *	A / B
	 *	@param Matrix $B Matrix B
	 *	@return Matrix Division result
	 */
	public function arrayRightDivide() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$validValues = True;
					$value = $M->get($i, $j);
					if ((is_string($this->A[$i][$j])) && (strlen($this->A[$i][$j]) > 0) && (!is_numeric($this->A[$i][$j]))) {
						$this->A[$i][$j] = trim($this->A[$i][$j],'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($this->A[$i][$j]);
					}
					if ((is_string($value)) && (strlen($value) > 0) && (!is_numeric($value))) {
						$value = trim($value,'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($value);
					}
					if ($validValues) {
						if ($value == 0) {
							//	Trap for Divide by Zero error
							$M->set($i, $j, '#DIV/0!');
						} else {
							$M->set($i, $j, $this->A[$i][$j] / $value);
						}
					} else {
						$M->set($i, $j, PHPExcel_Calculation_Functions::NaN());
					}
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function arrayRightDivide()


	/**
	 *	arrayRightDivideEquals
	 *
	 *	Element-by-element right division
	 *	Aij = Aij / Bij
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Matrix Aij
	 */
	public function arrayRightDivideEquals() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$this->A[$i][$j] = $this->A[$i][$j] / $M->get($i, $j);
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function arrayRightDivideEquals()


	/**
	 *	arrayLeftDivide
	 *
	 *	Element-by-element Left division
	 *	A / B
	 *	@param Matrix $B Matrix B
	 *	@return Matrix Division result
	 */
	public function arrayLeftDivide() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$M->set($i, $j, $M->get($i, $j) / $this->A[$i][$j]);
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function arrayLeftDivide()


	/**
	 *	arrayLeftDivideEquals
	 *
	 *	Element-by-element Left division
	 *	Aij = Aij / Bij
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Matrix Aij
	 */
	public function arrayLeftDivideEquals() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$this->A[$i][$j] = $M->get($i, $j) / $this->A[$i][$j];
				}
			}
			return $M;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function arrayLeftDivideEquals()


	/**
	 *	times
	 *
	 *	Matrix multiplication
	 *	@param mixed $n Matrix/Array/Scalar
	 *	@return Matrix Product
	 */
	public function times() {
		if (func_num_args() > 0) {
			$args  = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $B = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						if ($this->n == $B->m) {
							$C = new PHPExcel_Shared_JAMA_Matrix($this->m, $B->n);
							for($j = 0; $j < $B->n; ++$j) {
								for ($k = 0; $k < $this->n; ++$k) {
									$Bcolj[$k] = $B->A[$k][$j];
								}
								for($i = 0; $i < $this->m; ++$i) {
									$Arowi = $this->A[$i];
									$s = 0;
									for($k = 0; $k < $this->n; ++$k) {
										$s += $Arowi[$k] * $Bcolj[$k];
									}
									$C->A[$i][$j] = $s;
								}
							}
							return $C;
						} else {
							throw new PHPExcel_Calculation_Exception(JAMAError(MatrixDimensionMismatch));
						}
						break;
				case 'array':
						$B = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						if ($this->n == $B->m) {
							$C = new PHPExcel_Shared_JAMA_Matrix($this->m, $B->n);
							for($i = 0; $i < $C->m; ++$i) {
								for($j = 0; $j < $C->n; ++$j) {
									$s = "0";
									for($k = 0; $k < $C->n; ++$k) {
										$s += $this->A[$i][$k] * $B->A[$k][$j];
									}
									$C->A[$i][$j] = $s;
								}
							}
							return $C;
						} else {
							throw new PHPExcel_Calculation_Exception(JAMAError(MatrixDimensionMismatch));
						}
						return $M;
						break;
				case 'integer':
						$C = new PHPExcel_Shared_JAMA_Matrix($this->A);
						for($i = 0; $i < $C->m; ++$i) {
							for($j = 0; $j < $C->n; ++$j) {
								$C->A[$i][$j] *= $args[0];
							}
						}
						return $C;
						break;
				case 'double':
						$C = new PHPExcel_Shared_JAMA_Matrix($this->m, $this->n);
						for($i = 0; $i < $C->m; ++$i) {
							for($j = 0; $j < $C->n; ++$j) {
								$C->A[$i][$j] = $args[0] * $this->A[$i][$j];
							}
						}
						return $C;
						break;
				case 'float':
						$C = new PHPExcel_Shared_JAMA_Matrix($this->A);
						for($i = 0; $i < $C->m; ++$i) {
							for($j = 0; $j < $C->n; ++$j) {
								$C->A[$i][$j] *= $args[0];
							}
						}
						return $C;
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function times()


	/**
	 *	power
	 *
	 *	A = A ^ B
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Sum
	 */
	public function power() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
						break;
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$validValues = True;
					$value = $M->get($i, $j);
					if ((is_string($this->A[$i][$j])) && (strlen($this->A[$i][$j]) > 0) && (!is_numeric($this->A[$i][$j]))) {
						$this->A[$i][$j] = trim($this->A[$i][$j],'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($this->A[$i][$j]);
					}
					if ((is_string($value)) && (strlen($value) > 0) && (!is_numeric($value))) {
						$value = trim($value,'"');
						$validValues &= PHPExcel_Shared_String::convertToNumberIfFraction($value);
					}
					if ($validValues) {
						$this->A[$i][$j] = pow($this->A[$i][$j],$value);
					} else {
						$this->A[$i][$j] = PHPExcel_Calculation_Functions::NaN();
					}
				}
			}
			return $this;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function power()


	/**
	 *	concat
	 *
	 *	A = A & B
	 *	@param mixed $B Matrix/Array
	 *	@return Matrix Sum
	 */
	public function concat() {
		if (func_num_args() > 0) {
			$args = func_get_args();
			$match = implode(",", array_map('gettype', $args));

			switch($match) {
				case 'object':
						if ($args[0] instanceof PHPExcel_Shared_JAMA_Matrix) { $M = $args[0]; } else { throw new PHPExcel_Calculation_Exception(self::ArgumentTypeException); }
				case 'array':
						$M = new PHPExcel_Shared_JAMA_Matrix($args[0]);
						break;
				default:
						throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
						break;
			}
			$this->checkMatrixDimensions($M);
			for($i = 0; $i < $this->m; ++$i) {
				for($j = 0; $j < $this->n; ++$j) {
					$this->A[$i][$j] = trim($this->A[$i][$j],'"').trim($M->get($i, $j),'"');
				}
			}
			return $this;
		} else {
			throw new PHPExcel_Calculation_Exception(self::PolymorphicArgumentException);
		}
	}	//	function concat()


	/**
	 *	Solve A*X = B.
	 *
	 *	@param Matrix $B Right hand side
	 *	@return Matrix ... Solution if A is square, least squares solution otherwise
	 */
	public function solve($B) {
		if ($this->m == $this->n) {
			$LU = new PHPExcel_Shared_JAMA_LUDecomposition($this);
			return $LU->solve($B);
		} else {
			$QR = new PHPExcel_Shared_JAMA_QRDecomposition($this);
			return $QR->solve($B);
		}
	}	//	function solve()


	/**
	 *	Matrix inverse or pseudoinverse.
	 *
	 *	@return Matrix ... Inverse(A) if A is square, pseudoinverse otherwise.
	 */
	public function inverse() {
		return $this->solve($this->identity($this->m, $this->m));
	}	//	function inverse()


	/**
	 *	det
	 *
	 *	Calculate determinant
	 *	@return float Determinant
	 */
	public function det() {
		$L = new PHPExcel_Shared_JAMA_LUDecomposition($this);
		return $L->det();
	}	//	function det()
}	//	class PHPExcel_Shared_JAMA_Matrix